1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "uptime_parser.h"
18 
19 #include <time.h>
20 #include <cstdlib>
21 #include <string>
22 #include <android-base/file.h>
23 #include <android-base/logging.h>
24 
25 namespace bootstat {
26 
ParseUptime()27 time_t ParseUptime() {
28   std::string uptime_str;
29   if (!android::base::ReadFileToString("/proc/uptime", &uptime_str)) {
30     PLOG(ERROR) << "Failed to read /proc/uptime";
31     return -1;
32   }
33 
34   // Cast intentionally rounds down.
35   return static_cast<time_t>(strtod(uptime_str.c_str(), NULL));
36 }
37 
38 }  // namespace bootstat